PeterRus Posted July 14 Report Posted July 14 (edited) Lycoming IO-360-A3B6/M20J'97 Noticed last flight the pressure was comfortably above the red line. Reduced the RPM/manifold pressure and crawled at about 100 knots -- the pressure stayed within the green arc. At some point saw the oil pressure was jumping between normal and redline, then it settled in the green zone. Few hours after annual (and oil change). I added a part of oil soon after oil change -- the engine isn't consuming much oil but I thought the oil level was low. Oil temp was steady/normal, no other issues with engine instruments. Quick googling produced: 1. High oil pressure is normal, we want high oil pressure 2. Oil pressure valve regulator issues 3. Some blockage in the filter (metal?) 4. The oil pressure sensor faulty What does the hive wisdom say? Edited July 14 by PeterRus
redbaron1982 Posted July 14 Report Posted July 14 What type of oil pressure indicator do you have? I have a GI 275, and the oil pressure sensor failed a few years ago. Before completely failing it started to read wrong values. I had the original analogue gauge too, so it didn't concerned me much, but it would have been quite a different thing if I would have completely removed the analogue gauges.
N201MKTurbo Posted July 14 Report Posted July 14 I’ve never see the actual oil pressure intermittently fail high. I’ve seen it spike low when the oil level gets very low and starts sucking air into the pump. I can’t imagine a failure that would cause the oil bypass to stick closed. So, I would suspect a sensor issue. I would start by taking apart the CPC connector from the gauge cluster and spraying the pins with contact cleaner. Do the same with the firewall pass through connector. 1
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